Portable blackberry mobile phone charger

About the portable blackberry mobile phone charger my friend give me very the particular information. Actually the portable blackberry mobile phone charger is a kind of external charger battery. The portable blackberry mobile phone charger not only charge for blackberry but also can charge for iPhone, iPad, Nokia, Samsung and so on. But I first know this kind of external battery. So I feel the portable blackberry mobile phone charger is very interesting and I find it can make your don't worry about power off.